(19)
(11) EP 1 724 767 A8

(12) CORRECTED EUROPEAN PATENT APPLICATION
published in accordance with Art. 158(3) EPC

(15) Correction information:
Corrected version no 1 (W1 A1)

(48) Corrigendum issued on:
07.03.2007 Bulletin 2007/10

(43) Date of publication:
22.11.2006 Bulletin 2006/47

(21) Application number: 05719714.7

(22) Date of filing: 01.03.2005
(51) International Patent Classification (IPC): 
G11B 7/09(2006.01)
(86) International application number:
PCT/JP2005/003397
(87) International publication number:
WO 2005/083693 (09.09.2005 Gazette 2005/36)
(84) Designated Contracting States:
DE FR GB

(30) Priority: 01.03.2004 JP 2004056705
01.03.2004 JP 2004056710

(71) Applicant: Pioneer Corporation
Tokyo 1538654 (JP)

(72) Inventors:
  • NOMOTO, Takayuki, c/o PIONEER CORPORATION
    Tsurugashima-shi, Saitama 3502288 (JP)
  • NISHIWAKI, Hiroshi, c/o PIONEER CORPORATION
    Tokorozawa-shi,Saitama 3598522 (JP)

(74) Representative: Viering, Jentschura & Partner 
Steinsdorfstrasse 6
80538 München
80538 München (DE)

   


(54) TRACKING ERROR SIGNAL GENERATION DEVICE AND TRACKING ERROR SIGNAL GENERATION METHOD


(57) A detection signal S1 outputted from a light reception unit (11A) of detection means (11) formed by four-division light reception element is added to a detection signal S4 outputted from a light reception unit (11D) so as to obtain an addition signal S14 and a phase difference signal P1 indicating the phase difference between the addition signal S14 and the detection signal S1. Furthermore, a phase difference signal P4 indicating the phase difference between the addition signal S14 and the detection signal S4 is obtained. The phase difference signal P4 is subtracted from the phase difference signal P1 so as to generate a tracking error signal TE1.